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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | $ 47,665 | $ 57,126
Recorded Investment with Allowance | 35,709 | 47,667
Related Allowance | 5,797 | 3,268
Average Recorded Investment | 35,105 | 50,521
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 894 | 507
Recorded Investment with Allowance | 806 | 383
Related Allowance | 101 | 14
Average Recorded Investment | 825 | 446
Real Estate [Member] | Non-residential Real Estate Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 7,742 | 21,068
Recorded Investment with Allowance | 5,688 | 19,052
Related Allowance | 574 | 357
Average Recorded Investment | 5,854 | 19,655
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 1,878 | 1,401
Recorded Investment with Allowance | 1,683 | 1,209
Related Allowance | 124 | 81
Average Recorded Investment | 1,612 | 1,125
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 5,871 | 2,498
Recorded Investment with Allowance | 5,614 | 2,235
Related Allowance | 1,538 | 242
Average Recorded Investment | 5,445 | 1,958
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 12,015 | 13,897
Recorded Investment with Allowance | 6,272 | 10,312
Related Allowance | 1,457 | 2,062
Average Recorded Investment | 6,478 | 11,786
Consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 686 | 738
Recorded Investment with Allowance | 650 | 715
Related Allowance | 133 | 181
Average Recorded Investment | 788 | 652
Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 9,799 | 10,722
Recorded Investment with Allowance | 8,415 | 9,513
Related Allowance | 1,870 | 331
Average Recorded Investment | 8,062 | 10,335
Acquired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 8,780 | 6,295
Recorded Investment with Allowance | 6,581 | 4,248
Average Recorded Investment | $ 6,041 | $ 4,564

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524 + Details
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